Hi,
On Fri, Feb 17, 2023 at 04:24:32PM +0300, Natalia Petrova wrote:
> Return value of 'tb_switch_find_port' has to be checked to avoid
> null pointer dereferences in functions tb_tunnel_alloc_dma() and
NULL
> tb_port_info().
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Fixes: 386e5e29d81c ("thunderbolt: Make tb_find_port() available to other files")
> Signed-off-by: Natalia Petrova <n.petrova@xxxxxxxxxx>
> ---
> drivers/thunderbolt/tb.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
> index 9853f6c7e81d..5d6cded68d46 100644
> --- a/drivers/thunderbolt/tb.c
> +++ b/drivers/thunderbolt/tb.c
> @@ -1156,6 +1156,8 @@ static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd,
> sw = tb_to_switch(xd->dev.parent);
> dst_port = tb_port_at(xd->route, sw);
> nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI);
> + if (!nhi_port)
This really cannot happen in real life. All host routers must have a
host interface adapter so I'm not sure if adding these checks do
anything else than adding dead code.
> + return -EIO;
>
> mutex_lock(&tb->lock);
> tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, transmit_path,
> --
> 2.34.1
